"Demon with a Glass Hand" is an episode of The Outer Limits television series, the second to be based on a script by Harlan Ellison, which Ellison wrote specifically with actor Robert Culp in mind for the lead role. It originally aired on 17 October 1964, and was the fifth episode of the second season.[1]

In 2009, TV Guide ranked "Demon with a Glass Hand" #73 on its list of the 100 Greatest Episodes.[2]

"Through all the legends of ancient peoples — Assyrian, Babylonian, Sumerian, Semitic — runs the saga of the Eternal Man, the one who never dies, called by various names in various times, but historically known as Gilgamesh, the man who has never tasted death ... the hero who strides through the centuries ..."

Trent (Robert Culp) is a man with no memory of his life before the past ten days. His left hand has been replaced by an advanced computer shaped like his missing hand and protected by some transparent material. Three fingers are missing; the computer tells him they must be reattached before it can tell Trent what is going on. Trent is being hunted by a handful of humanoid aliens called the Kyben; they have the missing appendages. The action takes place in a large rundown office building which the Kyben have sealed off from the world. In this deadly game of hide-and-seek, Trent enlists the help of Consuelo Biros (Arlene Martel), a woman who works in the building.

For reasons unknown to him, Trent was sent into the past via a "time mirror", located in the building. A captured Kyben tells Trent that both of them are from a thousand years in the future. In that future, Earth has been conquered by the Kyben, but all the surviving humans except Trent have mysteriously vanished. The aliens are being obliterated by a "radioactive plague" that is killing all intelligent life on the planet, apparently unleashed by the humans in a last-ditch effort to repel the invasion. In a desperate attempt to find a cure for the plague and to extract whatever knowledge is stored in the hand/computer, the Kyben have followed him back in time with the missing fingers.

Eventually, Trent defeats all of his Kyben hunters by ripping off the medallion-shaped devices they wear to anchor them in the past. Trent successfully destroys the mirror and recovers the missing fingers, one by one. When the computer is whole, he learns the terrible truth: he is not a man, but a robot. The human survivors have been digitally encoded onto a gold-copper alloy wire wrapped around the solenoid in his thorax. Immune to disease, he must protect his precious cargo for 200 years after the Kyben invasion, by which time the plague will have dissipated. Then he will resurrect the human race.

Trent had thought he was a man, as he and Consuelo had begun to develop feelings for each other. With the truth revealed, she leaves him, pity mixed with horror in her eyes. Trent is left to face 1,200 years of lonely vigil.

"Like the Eternal Man of Babylonian legend, like Gilgamesh, one thousand plus two hundred years stretches before Trent. Without love. Without friendship. Alone; neither man nor machine, Waiting. Waiting for the day he will be called to free the humans who gave him mobility. Movement, but not life."

Ellison's story outline depicted a sprawling, cross-country chase between the Kyben and Trent (then named Mr. Fish). Because this would have been prohibitively expensive, producer Robert H. Justman suggested that Ellison contain most of the action in a single structure when he went to script. Ellison agreed, realizing that by forcing the plot into an enclosed space, the change from a linear pursuit to a vertical climb, ascending as the action developed, would make for heightened tension. Most of this episode was shot in the Bradbury Building, the same location used for the final scenes of Blade Runner and a closing scene in the 1950 film noir classic D.O.A.

Ellison's 10-page story outline was published in Brain Movies III in 2013.[3]

Ellison's friendship with Robert Culp dates from the production of this episode. He found Culp to be very intelligent, quite a contrast to most actors, whom he described as "dips — strictly non compos mentis."

Ellison's original script was published in Brain Movies Volume One, by Edgeworks Abbey, in 2011.[4]

During the run of Babylon 5, series creator J. Michael Straczynski often said that Ellison would write a sequel to this story (possibly called "Demon in the Dust" or "Demon on the Run") as an episode. Ellison was a creative consultant on the series and said in a behind-the-scene book about Babylon 5 written during that show's third season:[5]

"I want very much to write this script and Joe very much wants it, and I think it probably will get written during this next season, but one never knows. I don't want to promise because if you promise, then all of a sudden fans on the internet start screaming, 'Well, where is it, where is it? Why doesn't he do it, why isn't he doing it? He's late again, he's late again.' And then I have to get cranky, go to their house and nail their heads to a coffee table!"

Some media outlets had previously reported that "Demon with a Glass Hand" was the basis of a settlement that Ellison received after it was allegedly plagiarized for The Terminator. These claims were disputed by the argument that the claim and subsequent settlement were exclusively premised upon the argument that the opening moments of The Terminator had plagiarized the other Ellison script produced by The Outer Limits, "Soldier". Harlan Ellison himself clarified this in a 2001 exchange with a fan at his website: "'Terminator' was not stolen from 'Demon with a Glass Hand,' it was a ripoff of my OTHER Outer Limits script, 'Soldier.'"[6]

According to The Los Angeles Times, the parties settled the lawsuit for an undisclosed amount, and an acknowledgement of Ellison's work in the credits of Terminator.[7]

James Cameron emphatically denied Ellison's allegations and was opposed to the settlement, stating "For legal reasons I'm not suppose [sic] to comment on that (the addition of acknowledgement credits) but it was a real bum deal, I had nothing to do with it and I disagree with it."[8]

This episode was first transmitted in the UK on BBC2 on Friday 28 March 1980. Although the first season had been screened in the UK in 1964 by Granada TV, and a few other ITV regions, it wasn't until the BBC transmitted all 49 episodes, in two seasons between 28 March 1980 and 17 July 1981, that the second-season episodes were first seen in the UK. The BBC chose "Demon With A Glass Hand" as the first episode to be broadcast, none of the episodes were screened in series order, with second-season episodes mixed in with first-season episodes. This was also its last UK terrestrial television broadcast.[9][10][11]